\makeatletter
\def\writ@staffs{%
  \y@\staffbotmarg \global\altplancher\staffbotmarg
  \rlap{\n@loop\w@st\repeat
  \systemheight\y@
  \advance\systemheight-\altplancher
  \C@Inter \global\advance\systemheight-\stem@skip
  \ifx\empty\b@rule \raise\altplancher\rlap{%
      \vrule\@depth\hlthick\@height\systemheight\@width\lthick}\fi
  \g@loop
   \ifnum\uppersonginstrum<\lowersonginstrum
   \else
    \noinstrum@nt\uppersonginstrum\s@l@ctinstr\C@Inter
    \global\advance\g@h-\stem@skip \global\advance\g@h-\g@b
    \global\advance\g@h\csname staffspacing\romannumeral\noinstrum@nt\endcsname\Interligne \global\advance\g@b-\Internote
    \raise\g@b\llap{\uplap{\offinterlineskip
      \set@normalnotesize\hbox{\musixfont\fourt@@n}\hbox{\vrule\@height\g@h
        \@width\internote}\hbox{\musixfont\fiv@t@@n}}\kern\internote}%
   \fi
  \repeat
  \ifx\lin@bar\@ne \y@\altplancher \advance\y@\systemheight
    \advance\y@\raisebarno \raise\y@\rlap{\kern\shiftbarno\writebarno}\fi
  \advance\stafftopmarg\staffbotmarg
  \raise\stafftopmarg\hbox{\vrule\@height\systemheight\@width\z@}}}
\makeatother
